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Magnetic Depth Profiling of Al2O3 Fe Si Structure using NG1 Cold Neutron Reflectometer

This study aims to measure the structural and magnetic density profile of an Al2O3 Fe Si structure using neutron reflectivity. The objective is to obtain depth information up to 1 m and identify the mystery layer as iron silicide.

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Magnetic Depth Profiling of Al2O3 Fe Si Structure using NG1 Cold Neutron Reflectometer

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  1. Magnetic Depth Profiling of Al2O3/Fe/Si Structure using NG-1 Cold Neutron Reflectometer NCNR Summer School 2006 – Purple Group Hassan Raza, Preeti Sejwal, Hailiang Zhang, Jeffrey Gagliaro, Claire Pizzey, Mohan Babu Boggara

  2. Al2O3 Fe Si Al2O3/Fe/Si Structure MRAM Tunnel Magnetoresistance Hard Disk Giant Magnetoresistance Spintronic Field-Effect Transistor (Spin-FET) Objective and Motivation

  3. Neutron Reflectivity Specular: θout = θin Q = (4π/λ) sin θout λ = neutron wavelength (4.75 Å) • Measure reflected intensity as function of Q where Q ≈ 0.01 - 0.2 Å-1 (θ ≈ 0.1 – 3 deg) • Model data to obtain structural and magnetic density profile as a function of depth (upto 1µm)

  4. H NSF Incident Neutrons (+ +) (+ -) SF (- +) (- -) NSF Qz Unpolarized Neutron Scattering I  |b(z)|2 NSF (Non-Spin Flip) probes Moment || Field (H) INSF |b(z) ± M||(z)|2 H M M|| M Neutron Interaction with Magnetic Field

  5. NG-1

  6. Polarizer and Flipper (+/−) Detector Polarizer and Flipper (+/−) Slit 4 θ θ2 Slit 3 Sample Detector I Specular Scan θ2 = 2θ Log I Slit Scan θ2 = 0 Rocking Curve θ fixed, θ2 varying I θ Fixed slits Q Z Log I Background Scan θ2 ≠ 2θ Q Z Repeat each curve for: −+ −− B= A= +− D= ++ C= Q Z Data Reduction White Beam Monochromator Slit 1 Slit 2

  7. Reflectivity and Magnetic Depth Profiles Fe Al2O3 Fe Silicide Silicon

  8. Al2O3 Fe Mystery Layer Si Neutron SLD QM, Å-2 Thickness Roughness Magnetic SLD QM, Å-2 3.3e-6 362Å 70Å 0 7e-6 319Å 63Å 3.9e-6 6.2e-6 76Å 95Å 2.9e-7 2.1e-6 30Å 50Å 0 Structure Identified  Al2O3 Fe ? Si Mystery layer is iron silicide.

  9. Acknowledgements Thanks to Julie and Chuck Thanks to organizers and instructors for a very wonderful summer school 

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